Foundation 5's block grids for Bootstrap 3.

block-grid.less

// # Block Grid
//
// Technique adapted from Foundation 5 for Bootstrap 3.0.3 to at least 3.3.1.
// https://github.com/zurb/foundation/blob/f755d8704123f86c281ede0b171881e2672f150d/scss/foundation/components/_block-grid.scss
//
// # Example Usage
//
// To produce a grid of 2 items per row on an extra-small screen, and 3 items
// per row on a small screen:
//
//     <div class="block-grid-xs-2 block-grid-sm-3">
//         <div class="block-grid-item">
//             ...
//         </div>
//     </div>

[class*="block-grid-"] {
  display: block;
  margin: -(@grid-gutter-width/2);
  padding: 0;
  .clearfix();
}

.block-grid-item {
  display: inline;
  margin: 0;
  padding: (@grid-gutter-width/2);
  height: auto;
  float: left;
  width: 100%;
  list-style: none;  // for those who like to use `li` elements as block-grid-items
}

.block-grid (@per-row) {
  & > .block-grid-item {
    width: (100%/@per-row);

    @nth-equation: ~"@{per-row}n+1";
    &:nth-of-type(n) { clear: none; }
    &:nth-of-type(@{nth-equation}) { clear: both; }
  }
}

// Recursive loop that produces rules for block grids of @per-row many items
// per row down to 1 many items per row.
.block-grids(@size, @per-row: @grid-columns) when (@per-row > 0) {
  .block-grid-@{size}-@{per-row} { .block-grid(@per-row); }
  .block-grids(@size, (@per-row - 1));
}

.block-grids(xs);
@media (min-width: @screen-sm-min) { .block-grids(sm) }
@media (min-width: @screen-md-min) { .block-grids(md) }
@media (min-width: @screen-lg-min) { .block-grids(lg) }

Stylus Version

[class*="block-grid-"]
    display: block
    margin: -($grid-gutter-width / 2)
    padding: 0
    clearfix()

.block-grid-item
    display: inline
    margin: 0
    padding: ($grid-gutter-width / 2)
    height: auto
    float: left
    list-style: none

block-grid($per-row)
    & > .block-grid-item
        width: (100% / $per-row)

        $nth-equation : (#{$per-row}n) + "+" + 1
        &:nth-of-type(n)
            clear: none
        &:nth-of-type({$nth-equation})
            clear: both

block-grids($size)
    .block-grid-{$size}-1
        block-grid(1)
    .block-grid-{$size}-2
        block-grid(2)
    .block-grid-{$size}-3
        block-grid(3)
    .block-grid-{$size}-4
        block-grid(4)
    .block-grid-{$size}-5
        block-grid(5)
    .block-grid-{$size}-6
        block-grid(6)
    .block-grid-{$size}-7
        block-grid(7)
    .block-grid-{$size}-8
        block-grid(8)
    .block-grid-{$size}-9
        block-grid(9)
    .block-grid-{$size}-10
        block-grid(10)
    .block-grid-{$size}-11
        block-grid(11)
    .block-grid-{$size}-12
        block-grid(12)

block-grids(xs)
@media (min-width: $screen-sm-min)
    block-grids(sm)
@media (min-width: $screen-md-min)
    block-grids(md)
@media (min-width: $screen-lg-min)
    block-grids(lg)

Thank you very much for this information! I really need something like that in bootstrap project now!

Does it need to be inside a .row ? Thanks!

Nice! Thanks for sharing.